*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}
.box{
    height: 100vh;
    background: url(../imgs/04.jpg);
    background-size: cover;
    background-repeat: no-repeat;
}
h1{
    position: absolute;
    margin: 0;
    padding: 0;
    top: 50%;
    transform: translateY(-50%);
    text-align: center;
    font-size: 10rem;
    opacity: .5;
    color: #fff;
    text-transform: uppercase;
    text-shadow: 0 5px 15px rgba(0,0,0,1);
    box-shadow: 0 5px 15px rgba(0,0,0,1);
    /* 设置图片元素与父容器背景进行混合 */
    mix-blend-mode: overlay;
    pointer-events: none;
    background:rgba(0,0,0,.5);
}


